place popcorn in super large bowl and set aside. in large microwave safe bowl mix brown sugar and cinnamon. add butter and drizzle corn syrup over mixture. microwave for 30 second, remove and stir. place in microwave for another 2 minutes. remove, stir and place in microwave for additional 2 minutes.

working quickly, add vanilla, stir (will start bubbling) and then add baking soda and stir until light brown. do not over mix. pour mixture over popcorn and mix to cover popcorn.

place in oven and cook for 30 – 35 minutes, taking out to stir every 10 minutes. remove from oven and place on wax paper, let cool for 10 minutes.